Needleman-Wunsch Global Alignment

Perform optimal global pairwise sequence alignment using dynamic programming algorithm with customizable scoring parameters

Scoring Parameters

Dynamic Programming Matrix

Alignment Results

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Score
0%
Identity
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Gaps
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Length

What is Needleman-Wunsch Global Alignment?

The Needleman-Wunsch algorithm is a dynamic programming method for finding the optimal global alignment between two sequences. It guarantees the best possible alignment by considering all possible alignments and scoring them based on matches, mismatches, and gaps.

How to Use This Global Alignment Tool

Simple steps to align your sequences:

  1. Enter your two sequences in the input boxes
  2. Adjust scoring parameters if needed
  3. View the optimal alignment and statistics
  4. Download or copy the results

When to Use Global Alignment

This tool is essential for:

  • Comparing homologous sequences of similar length
  • Evolutionary distance analysis
  • Sequence similarity assessment
  • Phylogenetic studies
  • Identifying conserved regions

Example Input

Sample sequences for alignment:

Sequence 1: ACGTACGTACGT
Sequence 2: ACGTGCGTACGT

Try with your own sequences or use the Example button.

Example Output

Expected alignment format:

Seq1: ACGTACGTACGT
      ||||.|||||||
Seq2: ACGT-GCGTACGT
Score: 18, Identity: 91.7%

Complete alignment with score and statistics.

FAQ

Q: What scoring parameters should I use?
A: Default values (+2 match, -1 mismatch, -2 gap) work well for most DNA sequences. For proteins, consider using substitution matrices.

Q: How does this differ from local alignment?
A: Global alignment aligns entire sequences end-to-end, while local alignment finds the best matching regions.